Accelerated aging of onion seeds (Allium cepa L.) submitted to saturated salt solution

Abstract

Accelerated aging of onion seeds (Allium cepa L.) submitted to saturated salt solution Envejecimiento acelerado de semillas de cebolla (Allium cepa L.) sometidas a soluciones salinas saturadas ABSTRACTThe objective of the present study was to evaluate the methodology of the accelerated aging test to evaluate the physiological potential of onion seeds, as well as verify the possibility of using unsaturated and saturated solutions of sodium chloride (NaCl) as an option for water uptake control in seeds during the test without reducing sensitivity. Five lots of onion seeds were tested for germination, seedling emergence, emergence speed and accelerated aging (periods of 24, 48, 72, or 96 hours, with or without the use of a saturated saline solution of NaCl). The use of unsaturated and saturated solutions of NaCl reduced water absorption by onion seeds during the accelerated aging test, resulting in a less pronounced rate of deterioration, and less drastic and more uniform results. The 48 hour treatment with unsaturated and saturated NaCl solutions is an option for use because it promotes a better classification of the onion seed lots at different vigor levels. LILIAN MADRUGA DE TUNES RESUMENEl objetivo del presente estudio fue evaluar la metodología del test de envejecimiento acelerado para evaluar el potencial fisiológico de las semillas de cebolla, también verificar la posibilidad de usar soluciones de cloruro de sodio (NaCl) saturadas e insaturadas como una opción para controlar la absorción de agua de las semillas durante el test sin reducir su sensibilidad. En cinco lotes de semillas de cebolla sometidos a tratamientos de envejecimiento acelerado (periodos de 24, 48, 72 o 96 horas, con o sin el uso de soluciones saturadas de NaCl) se evaluó la germinación, emergencia de plántulas y la velocidad de emergencia. El uso de soluciones saturadas e insaturadas de NaCl redujo la absorción de agua por las semillas de cebolla durante el test de envejecimiento acelerado, dando como resultado una tasa de deterioro menos pronunciada y resultados menos drásticos y más uniformes. El tratamiento de 48 horas con soluciones insaturadas y saturadas de NaCl es una opción para usar, ya que promueve una mejor clasificación de los lotes de semillas de cebolla en diferentes niveles de vigor.

The effects of high oxygen partial pressure on vegetable Allium seeds with a short shelf-life

“…In both 'naturally' aged (dry stored long-term dry storage ~ 5% SMC, Table 1) and in classical artificial ageing assays at 70-90% RH and 42 °C a rapid decline in seed lot viability was observed for different Allium species (Table 1). After 2 days of equilibration at 70% RH our Allium 342 seed lot had a 9.5 ± 0.3% SMC; 70-80% RH is known to elevate the Allium SMC to ~ 9-13% and 90-100% RH to >15% (Boswell et al 1940;Salama and Pearce 1993;Madruga de Tunes et al 2011;Schwember and Bradford 2011;Selvi and Saraswathy 2018). A temperature of 40-50 °C combined with 70-100% RH was found to provide optimal assays for Allium seed lots (Boswell et al 1940;Delouche and Baskin 1973;Justice and Bass 1978;Salama and Pearce 1993;Madruga de Tunes et al 2011;Schwember and Bradford 2011;Selvi and Saraswathy 2018).…”